Motor



Oct. 13, 1942. L BucHMANN l MOTOR Filed July 1:5, 194.0

lNv NTOR Lows Buclmomn,

Y @M440 ATT RNEYS Patented Oct. 13, 1942 MOTOR l Louis Buchmann,Buffalo, NQY., assigner to Trico Products'Corporation, Buffalo, N. Y.

" Application July 13, 1940,- seriai No. 345,354

' .s Claims.y (ci. 121-497) The present invention relates to motorsoperable by differential fluid pressures and has particular relation tomotors oI' the generalltype employed for operating windshield cleanersand the like.

The invention contemplates a motor provided with valve means operated bya snap action mechanism for alternately placing the lmotor Vmember.

` For operating the latter between the two positions referred to, theremay be employed a snap action mechanism of the construction l Vshown inFig. 3, which is the subject matter of chamber` on opposite sides of thepiston means,

in communication with uid under a given pressure, and other valve meansoperating in response lto fluid pressure at'theopposite sides` of thechamber for alternately openinguthc opposite sides of the chamber toadifferential fluid pressure. By these meanslthe motor .willijoperatewith a slight dwell at the end o f'f each .stroke thereon instead of avrapid reversingwaction at the end of leach stroke.

y Means are provided'iorI admitting'fluid to'one o f the vchambersindependently of the nvalve means, to ell'ect parking of the,l piston ina predetermined position. ABythese means and a control valve which, ifdesired, may be locatedremotely to the motor, two fluidconduits'extending from the control valve to the motor may sufce tooperate and park the motor.

These and other objects and advantages will become apparent from thefollowing description of the typical embodiment of the invention shownin the accompanying drawing, wherein Fig. 1 is a front elevational viewof the motor with parts thereof broken and appearing in verticalsection;

Fig. 2 is a bottom plan view'of the cover section of the motor casing;and,

Fig. 3 is a front elevational v iew of a snap action mechanism foroperating a valve shown in Fig. 1.

The casing of the motor may comprise a body section II having a chamberI2 therein, and a cover section I3. A piston comprising a vane I4adapted for oscillation in an arcuate path within the chamber, lssecured to a rock shaft I 5 journaled in bearings `Iii of the casing.

On the cover section ls a valve seat I1 from which ports I8 and I9 openrespectively through passages 2| and 22 into the right and left sides ofthe motor chamberv I2. Another port, 23, from the valve seat l1,communicates through a passage 24 with a nipple 25.

Patent No. 1.978.634 granted to Henry Hueber on October 30, .1934. Thismechanism may con- ',sist of a kicker 3l which is pivoted to the shaftI5 'at the axis of the'latter and is engageable by faces 32 of a recessin the end of the shaft. The kicker is engageable with ears 33 on valve26`to shift the latter between its two operative positions, and itsouter end is engaged by a frame 34 which is anchored by a spring 35 to apressure plate 3B, the latter being mounted over the shaft I5 upon ap'ost 3l extended from the adjacent faceY of 'the casing section Il, thepressure plate bearingagainst the outer face of valve memberl. The valveitself differs from that ,shovmin Patent No.1,9'1834 in that it isadapted to block the ports I8 and I9 when the latter are' not ihcommunication with the port 23.

It 'will be seen -that when the shaft l5 moves angularly.counterclockwse as viewed in Fig. 3. right shoulder 32 will finallyengage and move kicker 3| until the outer end thereof passes beyond aline extended through the center of post 3T and the center of shaft I5,whereupon spring 35 will snap the kicker counterclockwise againstthe'left shoulder 33 of valve 26 and move the latter to its left limitposition wherein it opens port I9 to port 23 and port I8 is blocked.Movement of the shaft inthe opposite direction, or

` clockwise, will cause the parts to operate in the Upon seat I1andpivotally movable about the 23, depending upon the position of thevalve chamber.

reverse manner, snapping the valve t3 the position shown in Figs. 1 and3, wherein port I8 communicates with port 23 and port I9 is blocked.

Mounted in the cover section I3 are annular valve seats 4I and 42,the-central aperture through seat 4I opening into the right side of the.motor chamber, and the central aperture through seat 42 opening throughpassages 43 and 44 into a well 45 in the left side of the motor 'Thecover section I3 has an atmospheric vent 46 opening between the valveseats 4I and 42,- and a ball valve 41 is disposed between the seats,adapted to close against one or the other of them to close one side orthe other side of the motor chamber from the atmosphere.

A nipple 48 communicates with passage 43 and may be connected by asuitable conduit 49 to a port 5l in `a control valve member 52. Anotherport, 53, in the latter is connected, by a conduit 54,` with nipple 25;and a third port, 55, in the member may be connected to a suitablesource of less than atmospheric pressure. A manually movable valvemember 56, havim a recess 51, is adapted to be moved to open communicabein the position shown in Fig. 1:

2,298,734 v frei L f' side of the chamber will serve to lift valve 41against seat 42 (if it is not already in this position) admitting airinto the right side of chamber I4 and hence, moving the piston to aparked position wherein member 58 closes over Wall 45.

It will be understood that the motor structure herein shown anddescribed is merely an illusof the invention or the scope of theappended Air will enter vent 46 and flow past valve 41 through seat 42,passages ,43 and 44, and into the left side of the motor chamber, movingthe piston to the right, and the shaft I5 counterclockwise, sincepressure on the right side of the piston is sub-atmospheric, beingwithdrawn to the source of low pressure via passage 2l, port I8, recess21 in valve 26, port 23 and passage 24 to nipple 25.

When the piston approaches its limit of travel to the right, the valveaction shown in Fig. 3 will snap over, blocking port I8 and opening port23 to port I9. Thereupon the left side of the motor chamber willbesubjected to the subatmospheric pressure, via passage 22, port IS,lrecess 21, port 23, and passage 2,4 to nipple 25, while the right sideof the chamber is blocked from the subatmospheric source. This willresult in differential-pressure being applied to the opposite faces ofvalve 41 causing the latter to close against seat 42 and open the rightside of the chamber I2 to the atmosphere through seat 4I and vent 46.AccordingLvLthe piston will be urged to the left, the' shaft I5 movingclockwise.

. It will be understood that at the moment the valve moves to theposition blocking port I8 and opening port 23 to. port I9, atmosphericpressure will maintain in the left side of the motor chamber I2 while apartial vacuum exists in the right side of the chamber. This, togetherwith momentum of the piston and associated parts, will cause somecontinued movement of the piston and an increase in the pressure in theright side of the chamber. With pressure below the valve 41 approachingatmospheric, and a lower pressure above the valve effected by Withdrawalof fluid through passage 43, the valve 41 will move to a positionclosing upon seat 42 and opening the passage through valve seat 4I tothe atmosphere. Any leakage of air past valve'41 or past the pistonpacking that may occur at -the time when the valve 26 snaps over, willex- .I

' sure differential acting thereon; and, as a result,

the piston will start another stroke to the right.

It will be seen that the full suction of the sourcecannot be applied tothe motor chamber after the valve 26 has snapped over, until the valve41 shifts. This results in a slight dwell of the pistonrat the end ofeach operating stroke.

-When the control member 56 is moved to connect ports 5I and 55, theleft side of the motor chamber i-s connected to the low pressure sourcevia port 5I, conduit 49, nipple 48 and passage 44, while port 53 isblocked, preventing passage of uid from the motor chamber past valve 26.The resulting lowering of pressure in the left claims.

I claim:

1. In a motor, a chamber and piston means movable therein bydifferential pressures acting thereon, valve means operable by uidpressures for applying one of said pressures altema'tely to oppositesides of the chamber, other valve means for applying the other of saidpressures alternately to opposite sides of the chamber, and snap actionmeans vfor operating said other `valve means, and means for applyingsaid other of said pressures to one side of the chamber independently ofsaid other valve means.

2. In a motor, a chamber and piston means movable therein, valvel meansoperable by fluid pressure thereon for alternately opening the oppositesides of said chamber to the atmosphere, other valve means foralternately admitting pressure to opposite sides of said chamber andsnap action means for operating said other valve means, and means foradmitting fluid pressure to one side of the chamber independentlyofs'aid other valve means.

3. In a motor, a chamber and piston means movable therein, valve meansfor alternately admitting pressure tovthejopposite sides `ofthe chamberand snap action means actuatedl by the movement of the piston' means forshifting said valve means when the piston means approaches the terminalphase of each *'operatin'g stroke thereof, valve means operable in4response tothe differential pressure at the opposite sides of ,thechamber for alternately openingsaid` opposite sides of thel chamber tothe atmosphere,v and means for admitting pressure to one side of thechamber independently of the rst mentioned valve means. I

4. In a motor, a chamber and piston means movable therein, a fluidpassage opening through opposed valve seats into the chamber on oppositesides of the piston means, a ball valve adapted to close either one ofsaid seats to open or close communication between said passage and oneside or the other side of said chamber, and valve means for effecting areversal of fluid pressure in the opposite sides of the chamber to causesaid ball valve to move from one to the other of said seats.

5. In a motor, a chamber and piston means movable therein, a rst outletpassage and outlet ports connecting said outlet passage to the oppositesides of the chamber, valve means operable by and upon the piston meansapproaching the operating limit positions thereof to close said outletports alternatelyl inlet ports-into' the opposite sides of the chamberand pressure responsive valve means for closing said inlet portsalternately, a second outletpassage .from one .side of the chamber, andavvalve for vclosing one oi said outlet passages when the other thereofis open.

6. In a motor operable from a source of suction, a chamber;A andf pistonmeans movable therein, a first outlet passage and outlet portsconnecting said outlet passage to the opposite sides of the chamber,valve means operable by and upon the piston means approaching theoperating limit positions thereof to close said outlet portsalternately, atmospheric inlet ports into the opposite sides of thechamber and pressure responsive valve means for closing said inlet portsalternately from the atmosphere,'a second outlet passage from one sideof the chamber, and a valve for closingr either one of said outletpassages and opening the other thereof to a source of suction.

7. In amotor operable from a source of suction, a chamber and pistonmeans movable therein, a rst outlet passage .ccnnectible to a source ofsuction and outlet ports connecting said outlet passage to the oppositesides of the chamber, outlet valve means operable to close one and openthe other of said ports, snap action means operable by and upon thepiston means approachlng the operating limit positions thereof tooperate said outlet valve means, atmospheric inlet ports into theopposite sides of the chamber and inlet valve means for closing saidinlet ports alternately from the atmosphere, saidinlet valve means beingresponsive to and operable by fluidpressure therein as directed byoperation of said outlet valve means, and a second outlet passage fromone side of said chamber and connectible to a source of suction.

8. In a motor, an arcuate chamber, a rock shaft, a vane piston connectedto the shaft and adapted t9 oscillate .in said arcuate chamber, outletports from opposite sides of the chamber to a. source of suction, outletvalve means for closing said por'ts alternately, snap action meansoperable by said rock shaft for operating said valve means when thepiston approaches its operating limit positions, and valve meansoperable in response to the differential pressures at the opposite sidesof the chamber for alternately opening said opposite sides of thechamber to the atmosphere.

LOUIS BUCHMANN.

